/*  Copyright  2009
 *  @Author
 *  Richard Changde Yin            e-mail yinchangde@hotmail.com
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef COLLAPSAR_FUNCTION_TIME_CURDATE_H
#define COLLAPSAR_FUNCTION_TIME_CURDATE_H

#include "function/time/date.h"
#include "temporal.h"

/* Abstract CURDATE function. See also Item_func_curtime. */
class Item_func_curdate :public Item_date
{
protected:
  COLLAPSAR_TIME ltime;
  collapsar::Date cached_temporal;
public:
  Item_func_curdate() :Item_date() {}
  void fix_length_and_dec();
  /**
   * All functions which inherit from Item_date must implement
   * their own get_temporal() method, which takes a supplied
   * collapsar::Date reference and populates it with a correct
   * date based on the semantics of the function.
   *
   * For CURDATE() and sisters, there is no argument, and we
   * return a cached Date value that we create during fix_length_and_dec.
   *
   * Always returns true, since a Date can always be constructed
   * from a time_t
   *
   * @param Reference to a collapsar::Date to populate
   */
  bool get_temporal(collapsar::Date &temporal)              ;

  virtual void store_now_in_TIME(COLLAPSAR_TIME *now_time)=0;

  bool check_vcol_func_processor(unsigned char *)
                                               { return true; }
};

class Item_func_curdate_local :public Item_func_curdate
{
public:
  Item_func_curdate_local() :Item_func_curdate() {}
  const char *func_name() const { return "curdate"; }
  void store_now_in_TIME(COLLAPSAR_TIME *now_time);
};

class Item_func_curdate_utc :public Item_func_curdate
{
public:
  Item_func_curdate_utc() :Item_func_curdate() {}
  const char *func_name() const { return "utc_date"; }
  void store_now_in_TIME(COLLAPSAR_TIME *now_time);
};

#endif /* COLLAPSAR_FUNCTION_TIME_CURDATE_H */
